Molded directly from an original 1746 Willits marked Brown Bess musket. This swivel is drilled and tapped for a 6-40 screw. You will need to deburr the casting gate and polish. The inside mount is approximately 3/4" wide to fit the front bow of your triggerguard. Swivel is about 2" wide at the at the widest point. Wax cast steel, made in the U.S.A.